You need to write a Thank You note for the Interview. Thank you notes should be written and sent within 48 hours of the actual interview (face-to-face or phone).

Interviewer's First and Last Name
Street Address
City, State, Zip

Month, Day Year

Dear Mr. or Mrs or Dr ___:

First Paragraph:
First Sentence: Thank them for the interview
Second Sentence: Express interest in the position
Third Sentence: Reiterate your experience that will help you in the position at their company

Second Paragraph
First Sentence: Remind them of your contact information
Second Sentence: Let them know that you will follow up again in X days/weeks to find out the status of the job opening

Sincerely,

Signature in the middle

Your First and Last Name